1 Convert the image to grayscale by choosing Image > Mode > Grayscale. Only 8-bit grayscale images can be converted to duotones.
2 Choose Image > Mode > Duotone.
3 In the Duotone Options dialog box, select Preview to view the effects of the duotone settings on the image.
4 Select Monotone, Duotone, Tritone, or Quadtone for Type.
5 To specify ink colors, click the color box (the solid square) for an ink. Then use the color picker or the Custom Colors dialog box to select an ink. (See "Using the Adobe Color Picker" on page 261.)
Note: To produce fully saturated colors, make sure that inks are specified in descending order—darkest at the top, lightest at the bottom.
6 Click the curve box next to the color ink box and adjust the duotone curve for each ink color. (See "Modifying the duotone curve" on page 480.)
7 Set overprint colors, if necessary. (See "Specifying overprint colors" on page 481.)
To apply a duotone effect to only part of an image, convert the duotone image to Multichannel mode—this converts the duotone curves to spot channels. You can then erase part of the spot channel for areas that you want printed as standard grayscale. (See "Adding spot colors (Photoshop)" on page 272.)
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